Viewing the source of that webpage really takes you back. Plain old HTML. It's nostalgic beauty.
I recently fixed up an old 486 I purchased off eBay but it was bittersweet when I managed to get it connected to the 'net. Most websites were inaccessible due to the lack of support for today's encryption protocols, those that were had numerous JavaScript issues.
Try browservice: https://github.com/ttalvitie/browservice